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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2a8a3c9fdf8f41de062fa53a369fd01eb89fe65b7650202da04a5b25e1a8456' 
  AND token = 'SczsNoj9tDJDPH34G8Hr3dEu900tWFeLjXMYkRcYyrY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}